It was a key day in the Karen Read murder trial as biomedical engineer Judson Welcher, a prosecution crash reconstruction expert, showed highly detailed video that illustrated what he said the data shows about Read's SUV and John O'Keefe's death — but his testimony ended with a dramatic objection over his conclusion on what happened.

We break down what the jury saw — and what they missed while out of the courtroom — as well as what the defense's addition of four new witnesses may suggest about their strategy, which will reveal itself when they soon present their case in chief.You can watch the TV version of this episode — and all the others, as

well as video from court as it happens — on our YouTube page. Subscribe

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